// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://codemirror.net/LICENSE

(function(mod) {
    if (typeof exports == "object" && typeof module == "object") // CommonJS
        mod(require("../../lib/codemirror"), require("../xml/xml"), require("../javascript/javascript"), require("../css/css"));
    else if (typeof define == "function" && define.amd) // AMD
        define(["../../lib/codemirror", "../xml/xml", "../javascript/javascript", "../css/css"], mod);
    else // Plain browser env
        mod(CodeMirror);
})(function(CodeMirror) {
    "use strict";

    var defaultTags = {
        script: [
            ["lang", /(javascript|babel)/i, "javascript"],
            ["type", /^(?:text|application)\/(?:x-)?(?:java|ecma)script$|^module$|^$/i, "javascript"],
            ["type", /./, "text/plain"],
            [null, null, "javascript"]
        ],
        style:  [
            ["lang", /^css$/i, "css"],
            ["type", /^(text\/)?(x-)?(stylesheet|css)$/i, "css"],
            ["type", /./, "text/plain"],
            [null, null, "css"]
        ]
    };

    function maybeBackup(stream, pat, style) {
        var cur = stream.current(), close = cur.search(pat);
        if (close > -1) {
            stream.backUp(cur.length - close);
        } else if (cur.match(/<\/?$/)) {
            stream.backUp(cur.length);
            if (!stream.match(pat, false)) stream.match(cur);
        }
        return style;
    }

    var attrRegexpCache = {};
    function getAttrRegexp(attr) {
        var regexp = attrRegexpCache[attr];
        if (regexp) return regexp;
        return attrRegexpCache[attr] = new RegExp("\\s+" + attr + "\\s*=\\s*('|\")?([^'\"]+)('|\")?\\s*");
    }

    function getAttrValue(text, attr) {
        var match = text.match(getAttrRegexp(attr))
        return match ? /^\s*(.*?)\s*$/.exec(match[2])[1] : ""
    }

    function getTagRegexp(tagName, anchored) {
        return new RegExp((anchored ? "^" : "") + "<\/\s*" + tagName + "\s*>", "i");
    }

    function addTags(from, to) {
        for (var tag in from) {
            var dest = to[tag] || (to[tag] = []);
            var source = from[tag];
            for (var i = source.length - 1; i >= 0; i--)
                dest.unshift(source[i])
        }
    }

    function findMatchingMode(tagInfo, tagText) {
        for (var i = 0; i < tagInfo.length; i++) {
            var spec = tagInfo[i];
            if (!spec[0] || spec[1].test(getAttrValue(tagText, spec[0]))) return spec[2];
        }
    }

    CodeMirror.defineMode("htmlmixed", function (config, parserConfig) {
        var htmlMode = CodeMirror.getMode(config, {
            name: "xml",
            htmlMode: true,
            multilineTagIndentFactor: parserConfig.multilineTagIndentFactor,
            multilineTagIndentPastTag: parserConfig.multilineTagIndentPastTag
        });

        var tags = {};
        var configTags = parserConfig && parserConfig.tags, configScript = parserConfig && parserConfig.scriptTypes;
        addTags(defaultTags, tags);
        if (configTags) addTags(configTags, tags);
        if (configScript) for (var i = configScript.length - 1; i >= 0; i--)
            tags.script.unshift(["type", configScript[i].matches, configScript[i].mode])

        function html(stream, state) {
            var style = htmlMode.token(stream, state.htmlState), tag = /\btag\b/.test(style), tagName
            if (tag && !/[<>\s\/]/.test(stream.current()) &&
                (tagName = state.htmlState.tagName && state.htmlState.tagName.toLowerCase()) &&
                tags.hasOwnProperty(tagName)) {
                state.inTag = tagName + " "
            } else if (state.inTag && tag && />$/.test(stream.current())) {
                var inTag = /^([\S]+) (.*)/.exec(state.inTag)
                state.inTag = null
                var modeSpec = stream.current() == ">" && findMatchingMode(tags[inTag[1]], inTag[2])
                var mode = CodeMirror.getMode(config, modeSpec)
                var endTagA = getTagRegexp(inTag[1], true), endTag = getTagRegexp(inTag[1], false);
                state.token = function (stream, state) {
                    if (stream.match(endTagA, false)) {
                        state.token = html;
                        state.localState = state.localMode = null;
                        return null;
                    }
                    return maybeBackup(stream, endTag, state.localMode.token(stream, state.localState));
                };
                state.localMode = mode;
                state.localState = CodeMirror.startState(mode, htmlMode.indent(state.htmlState, "", ""));
            } else if (state.inTag) {
                state.inTag += stream.current()
                if (stream.eol()) state.inTag += " "
            }
            return style;
        };

        return {
            startState: function () {
                var state = CodeMirror.startState(htmlMode);
                return {token: html, inTag: null, localMode: null, localState: null, htmlState: state};
            },

            copyState: function (state) {
                var local;
                if (state.localState) {
                    local = CodeMirror.copyState(state.localMode, state.localState);
                }
                return {token: state.token, inTag: state.inTag,
                    localMode: state.localMode, localState: local,
                    htmlState: CodeMirror.copyState(htmlMode, state.htmlState)};
            },

            token: function (stream, state) {
                return state.token(stream, state);
            },

            indent: function (state, textAfter, line) {
                if (!state.localMode || /^\s*<\//.test(textAfter))
                    return htmlMode.indent(state.htmlState, textAfter, line);
                else if (state.localMode.indent)
                    return state.localMode.indent(state.localState, textAfter, line);
                else
                    return CodeMirror.Pass;
            },

            innerMode: function (state) {
                return {state: state.localState || state.htmlState, mode: state.localMode || htmlMode};
            }
        };
    }, "xml", "javascript", "css");

    CodeMirror.defineMIME("text/html", "htmlmixed");
});
